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The strongest winds around the coastline of Nova Scotia, the Bay of Fundy area of New Brunswick and into P.E.I.

Ghosts and goblins in the Maritimes may have to hold tight to their candy bags on Halloween night, with Environment Canada issuing wind warnings for Thursday night and Friday.

CBC meteorologist Kalin Mitchell said 20 to 40 millimetres of rain is also expected and that could bring localized flooding.

"There's a big low pressure system approaching the Maritimes overnight tonight and into Friday," Mitchell said.

"This system could lead to localized flooding and isolated power outages if branches come down. Watch out for slick road conditions, especially if leaves become plastered to the highways. Be very careful out there."

While the bad weather should arrive after trick-or-treaters have made their rounds, Environment Canada warned potentially damaging winds are expected in the evening.

Mitchell said winds will steadily pick up after midnight and through the day Friday, with the strongest winds around the coastline of Nova Scotia, the Bay of Fundy area of New Brunswick and into P.E.I.

Winds in those areas will be sustained at 40 to 50 kilometres per hour, but can gust at 90 kilometres an hour, he said.

"It would be a very good idea to bring in Halloween decorations Thursday evening or risk having them spread across the neighbourhood on Friday," Mitchell said.

"There will also be an increased risk of localized flooding due to the fallen leaves over the past few weeks potentially blocking some drainage systems."

A travel advisory has been issued for the Confederation Bridge, warning drivers that high winds on Friday may result in traffic restrictions.

Also, Friday's crossings on the Princess of Acadia between Saint John, N.B., and Digby, N.S., have been cancelled due to bad weather.